Henry McCullough, who famously played guitar in Paul McCartney’s band Wings, is critical condition following a heart attack he suffered on Monday (Nov. 5). In an interview with the BBC, McCullough’s sister Rae Morrison expressed her anxiety about the situation: “We really are very worried for him. His sister is on her way home from Florida and his brother is coming home from Glasgow [Scotland].”

The Nortstewart, Northern Ireland native was a member of Wings for roughly a year and a half during the early 1970s, and he played on 1973’s Red Rose Speedway album. He also totes credits playing with Joe Cocker and performed with him at the legendary Woodstock festival in 1969.

Our thoughts and prayers are with McCullough’s family during this difficult time.